Relay-load/ratio valve for use in brake applications on air-spri

Details Relay-load/ratio valve for use in brake applications on air-spri Relay-load/ratio valve for use in brake applications on air-spri

1981-10-05

1983-06-14

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Load control

Responsive to fluid pressure spring

188195, 303 23A, 303 40, 105215C, B60T 818

Patent

active

043879330

ABSTRACT:
A control valve is provided for use in brake applications in air-spring equipped railroad and highway vehicles, particularly convertible rail-highway semi-trailers. Such vehicles usually employ pneumatic brake cylinders. The control valve combines the functions of a relay valve with two distinct output limiting characteristics, namely, service and emergency, which output limiting characteristics depend upon vehicle weight is indicated by air spring pressure. The control valve also produces an automatic minimum output to prevent total loss of braking should air spring pressure be lost due to failure.

REFERENCES:
patent: 3606485 (1971-09-01), Scott
patent: 3671087 (1972-06-01), Pekrul
patent: 3936097 (1976-02-01), Yanagawa et al.
patent: 3944294 (1976-03-01), Masuda et al.
patent: 4202277 (1980-05-01), Browne et al.

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